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If the VFD is not of exceptionally poor design you will be able to hard wire an E-Stop switch directly to the VFD data inputs and configure the function in parameters if required, when activated this...

Also you can factor in that there is little to no torque on start up of the spindle with these type of spindles .

There will be interlocks on a commercial machine. I was contemplating my little SX2.7 but realised that I'd previously removed the swarf guard from around the spindle - of course its a requirement to...

I realise that I have to trust some amount of hardware and software. However, I am more concerned about triggering the "start" function by accident, which would move the spindle to the next position...

A little less certain that powering off the VFD, you could incorporate a switch in the control cable from the computer to the VFD preventing it being remotely activated by accident. This doesn't...

No, I never turn off the VFD during tool change. Would probably double tool-change time, waiting for VFD to power down/run up. I'm with Doddy - life's too short...

You are correct - as far as providing a completely safe solution you would require to disconnect the supply. The manual does indicate an electromagnetic contactor (relay) but notes that this should...